Turbine-driven centrifugal pump.



W. SCHEURMANN. lTURBINE DRIVEN GENTRIFUGAL PUMP. y APPLIOATION FILEDPEB. 13, 1911. 1,@04,822 Patented 001.3, 1911.

@hemd www4/MM 5?/ burrnn efrafrns rar-nur WALTER SCHEURMAN N, V01SNEWARK-UPON-TREN T, ENGLAND, ASSIGNOR T0 HENRY R.

WORTHINGTON, A CORPORATION 0F NEW JERSEY. y

TERMINE-naiven CENTRIFUGAL PUMP. i

To all whom 'it may concern.'

Be it known that I, WALTER SGHEUR- MANN, a citizen of the Republic ofSwitzeu land residing at Newark-uponTrent, 'Eng land, have inventedcertain new and useful Improvements in Turbine-Driven Centrifugal Pumps,fully described and represented in the following specification and theaccompanying drawing, forming a part of the same.

This invention relates to an improved Y combinat-ion of steam turbineand direct driven centrifuga-l pump, by which the construction issimplifed,the weight and overall lengths reduced, unnecessary partseliminat-ed and eiiciency improved.

The general practice in building steam turbines and (centrifugal pumpsvdirect driven thereby has been to build the turbines and pumpssubstantially as independ-v ent units, with separate casings, theusualstuffing boxes, labyrinth packings and intermediate bearings between theturbine and pump. In accordance with the present invention, the sha-ftextends direct-ly from the turbine into the pump through a sleeve formedor carried the turbine and pump covers, so that the shaft is inclosedthroughvout the turbine and pump, and the space between the shaft and.sleeve is sealed to prevent leakage-between the turbine and pump andthe iecessary lubrication provided, by introducing water or other lubricant under suitable pressure. The turbine and pump are thus broughtclose together and the usual stuffing boxes and packings for preventingleakage from the turbine and pump casings are not required. The turbineand pump covers are preferably combined in one casting for economy of`weight and space, although this is not essential.

In some constructions in which the pressure of the liquid in the pump orthat 0f the sealing liquid introduced between the turbine and pump mayexceed that of the adjoining turbine space, there may be danger of theliquid leaking in too large quantities along the clearance left aboutthe rotating shaft, so as to accumulate in the turbine and interferewith its satisfactory working. To avoid this leakage in such cases, Ipreferably form an ejector around the shaft between the turbine andpump, by which Specification of Letters Patent.

Application led February 13, 1911.

Patented Uet. 3, 1.911. Serial No.1608,317.

In the drawing Figure l is a central vertical section of a horizontalcombined turbine and centrifugal pump. Fig. 2 is @a detail section of aportion of the ejector illustrating the ejector action.

. Referring to said drawings, A is the turbine rotor and the pumpimpellers, the pump being shown as a three-stage centrifugal pump of awell known type, the turbine and pump impellers having the common lshaftC by which the impellers are direct driven by,the turbine. The pumpsuction D (shown in dotted lines) is next the turbine and E is thedelivery chamber surrounding the last impeller. The turbine casing Fandpump casing G are closed at their adjacent ends by the common head orcover H through a. cent-ral opening in which the shaft C extends fromthe turbine to the pump, so that the shaft is inclosed between theturbine and pump by t-he head or cover. This head or cover H between theturbine and pump is of such a thickness as to provide for introductionof sealing liquid into the clearance space between the shaft and head,so as to avoid leakage in either direction between the turbine and pump,this sealing liquid being taken from theA pump or any other sourcesuitable to secure the desired pressure.

In the preferred constructionshown, an ejector is formed about the shaftby which liquid in the clearance space is conducted away so as toprevent the passage to the turbine of either the sealing liquid orliquid from the adjacent pump space. In this construction the sleevebet-Ween the turbine and pump, in which theshaft runs, is divided intotwo sleeves, 1, 2, and these sleeves are arranged at their adjacent endsto form the ejector, by which the velocity of the liquid passing throughthe ejector throat into the diffusing portion of the ejector is changedinto pressure and the liquid delivered through the outlet passage so asto prevent its leakage into the turbine. The liquid enters from inlet 4into the small circular chamber 5 about the sleeve 2 and throughopenings 6 into the clearance space between sleeve 2 and the shaft andthen through the ejector formed between the adjacent ends of sleeves 1,2 into circular chamber 7 and to outlet 8, from which it is led eitherto the atmosphere or to the vacuum space in4 the condenser and air pumpas desired and according to the pressures used. The action of theejector will be clear from the detail Fig. 2.

l/Vhile the invention has been illust-rated and described in connectionwith a steam turbine and centrifugal pump for liquids, the invention isapplicable also to gas turbines and to other rotary pumps for liquidsand to rotary air or gas pumps or compressors, and the feature of theejector on the clearance space may be used in other classes ofconstructions in which such shaft sealing or lubrication lis requiredand such uses are `within the invention.

It will be understood that the invention is not to be limited to thedetail form or particular arrangement of parts in the constructionillustrated, but that many modifications rnay be made within theinvention as defined by the claims.

What I claim is 1. A combined turbine and direct driven centrifugal pumpor the like, having its shaft inclosed between the t-urbine and pump andhaving a liquid seal to prevent leakage between the turbine and pumpformed by circulating liquid through the 2. A combined turbine anddirect driven centrifugal pump or the like, having its shaft inclosedbetween the turbine and pump and having a liquid seal to prevent leakagebetween the turbine and pump formed-by circulating liquid through theclearance space about the shaft independently of the turbine chamber,and an ejector about-the shaft through which the liquid passes from theclearance space.

3. A combined centrifugal pump or the like, having its shaft inclosedbetween the turbine and pump and having a liquid seal to prevent leakagebetween the turbine and pump formed by circulating liquid through theclearance space about the shaft independently of the turbine chamber,and a sleeve surrounding the shaft between the turbine and pump andarranged to form an ejector through whichy the liquid passes from theclearance space.

4. The combination with a shaft and pasf sages for circulating liquidthrough the clearance space about the shaft, of an ejector inclosing theshaft for conducting the liquid from the clearance space. l

5. The combination with a shaft, of sleeves 1, 2, about the shaftarranged toV form at their adjacent ends an ejector for conductingliquid from the clearance space about the shaft.

In testimony whereof, I have hereuntosetmy hand, in the presence of twosubscriblng witnesses.

WALTER SCHEURMANN.

Witnesses:

GEO. F. SANDIFORD, A. WoLs'rENHoLME.

turbine and direct driven l

